import uuid

from django.core.validators import (MaxValueValidator, MinLengthValidator,
                                    MinValueValidator)
from django.db import models
from django.db.models.signals import post_delete, pre_delete
from django.dispatch import receiver
from telegram.bot import Bot

# Create your models here.


class Timestampable(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)
    uuid = models.UUIDField(default=uuid.uuid4, editable=False, primary_key=False)

    class Meta:
        abstract = True

    def __str__(self):
        return repr(self)

    def __repr__(self):
        return f'{type(self).__name__}(**{repr(self.__dict__)})'

    def on_pre_delete(self, sender, instance, **kwargs):
        pass

    def on_post_delete(self, sender, instance, **kwargs):
        pass


@receiver(models.signals.post_delete)
def timestampable_on_post_delete(sender, instance, **kwargs):
    if issubclass(sender, Timestampable):
        instance.on_post_delete(sender, instance, **kwargs)


@receiver(models.signals.pre_delete)
def timestampable_on_pre_delete(sender, instance, **kwargs):
    if issubclass(sender, Timestampable):
        instance.on_pre_delete(sender, instance, **kwargs)


class TelegramGroup(Timestampable):
    AUTO_COLLECT = True
    telegram_id = models.BigIntegerField()
    telegram_title = models.CharField(max_length=255)
    owner = models.ForeignKey(to='TelegramUser', on_delete=models.SET_NULL, blank=False, null=True, related_name='owns')
    # preferences <- GroupPreferences:group
    # users_with_pending_captcha <- PendingCaptchaUser:group
    # admins <- TelegramUser:admins

    class Meta:
        ordering = ['telegram_title', 'telegram_id']


class TelegramUser(Timestampable):
    AUTO_COLLECT = True
    telegram_id = models.BigIntegerField(blank=False, null=False)
    telegram_first_name = models.CharField(max_length=255, blank=False, null=False)
    telegram_last_name = models.CharField(max_length=255, blank=True, null=True)
    telegram_username = models.CharField(max_length=255, blank=True, null=True)
    admins = models.ManyToManyField(to=TelegramGroup, related_name='admins')
    # login_hashes <- LoginHash:telegram_user
    # pending_captchas <- PendingCaptchaUser:user
    # bots <- TelegramUserBots:owner

    class Meta:
        ordering = ['telegram_first_name', 'telegram_id']

    @property
    def name(self):
        return f'{self.telegram_first_name} {self.telegram_last_name or ""}'.strip()


class TelegramUserBots(Timestampable):
    owner = models.ForeignKey(to=TelegramUser, on_delete=models.CASCADE, blank=False, null=False, related_name='bots')
    name = models.CharField(max_length=255, blank=False, null=False)
    token = models.CharField(max_length=255, blank=False, null=False)
    telegram_username = models.CharField(max_length=255, blank=False, null=False)
    telegram_id = models.BigIntegerField()

    def on_pre_delete(self, sender, instance, **kwargs):
        if instance.token is not None and instance.token != '':
            Bot(instance.token).set_webhook(url='')

    @property
    def as_user(self):
        return TelegramUser.objects.get(telegram_id=self.telegram_id)

    class Meta:
        ordering = ['name', 'telegram_username', 'telegram_id']


class LoginHash(Timestampable):
    AUTO_COLLECT = True
    telegram_user = models.ForeignKey(to=TelegramUser, on_delete=models.CASCADE, blank=False, null=False, related_name='login_hashes')

    class Meta:
        ordering = ['telegram_user']


class GroupPreferences(Timestampable):
    group = models.OneToOneField(to=TelegramGroup, on_delete=models.CASCADE, blank=False, null=False, related_name='preferences')
    # Anti-Spam
    combot_anti_spam_use = models.BooleanField(default=False, blank=True, null=False)
    combot_anti_spam_notification = models.TextField(default='', blank=True, null=False)
    # Greetings
    join_message = models.TextField(max_length=4000, default='', blank=True, null=False)
    leave_message = models.TextField(max_length=4000, default='', blank=True, null=False)
    # Captcha
    captcha_use = models.BooleanField(default=False, blank=True, null=False)
    captcha_chars = models.CharField(max_length=255, default='0123456789', blank=False, null=False, validators=[MinLengthValidator(2)])
    captcha_digits = models.IntegerField(default=7, blank=True, null=False, validators=[MinValueValidator(1), MaxValueValidator(24)])
    captcha_timeout = models.IntegerField(default=240, blank=True, null=False, validators=[MinValueValidator(15), MaxValueValidator(600)])
    captcha_attempts = models.IntegerField(default=5, blank=True, null=False, validators=[MinValueValidator(2), MaxValueValidator(20)])
    captcha_first_message = models.TextField(max_length=1000, default='', blank=True, null=False)
    captcha_retry_message = models.TextField(max_length=1000, default='', blank=True, null=False)
    captcha_leave_mess = models.BooleanField(default=False, blank=True, null=False)
    # Canned Messages
    # canned_messages <- GroupCannedMessage:group_preferences

    class Meta:
        ordering = ['group']


class GroupCannedMessage(Timestampable):
    group_preferences = models.ForeignKey(to=GroupPreferences, on_delete=models.CASCADE, blank=False, null=False, related_name='canned_messages')
    listen = models.CharField(max_length=255)
    reply_with = models.TextField(max_length=4000)

    class Meta:
        ordering = ['group_preferences', 'listen', 'reply_with']


class PendingCaptchaUser(Timestampable):
    AUTO_COLLECT = True
    bot_token = models.CharField(max_length=255, blank=False, null=False)
    captcha_answer = models.CharField(max_length=255, blank=False, null=False)
    group = models.ForeignKey(to=TelegramGroup, on_delete=models.CASCADE, related_name='users_with_pending_captcha')
    user = models.ForeignKey(to=TelegramUser, on_delete=models.CASCADE, related_name='pending_captchas')
    lifetime = models.IntegerField(blank=True, null=False)
    attempts_left = models.IntegerField(blank=True, null=False)
    captcha_message_id = models.IntegerField(blank=True, null=False)

    class Meta:
        ordering = ['-lifetime', 'attempts_left', 'user', 'group', 'captcha_answer']